That is, an object of the world, something that exists in reality or fantasy. Nouns have different classifications and refer to concepts in the world. If they have a unique and distinctive character they are written with capital letters, as for a city or a person. Then they can have a concrete or intangible nature, such as the word 'possibilità'. Finally, they can also have a plural character and indicate a group as for example the word 'gregge' which is singular but indicates a group of sheep